diff --git a/validphys2/src/validphys/config.py b/validphys2/src/validphys/config.py
index f0fcd5bba7..d2ffeaf0c4 100644
--- a/validphys2/src/validphys/config.py
+++ b/validphys2/src/validphys/config.py
@@ -52,7 +52,6 @@
 
 from validphys.paramfits.config import ParamfitsConfig
 
-from validphys.theorycovariance.theorycovarianceutils import process_lookup
 from validphys.plotoptions import get_info
 
 import validphys.scalevariations
@@ -763,9 +762,13 @@ def produce_matched_datasets_from_dataspecs(self, dataspecs):
 
             with self.set_context(ns=self._curr_ns.new_child(spec)):
                 _, data_input = self.parse_from_(None, "data_input", write=False)
-                names = {
-                    (process_lookup(dsin.name), dsin.name): dsin for dsin in data_input
-                }
+
+                names = {}
+                for dsin in data_input:
+                    cd = self.produce_commondata(dataset_input=dsin)
+                    proc = get_info(cd).nnpdf31_process
+                    ds = dsin.name
+                    names[(proc, ds)] = dsin
 
                 all_names.append(names)
         used_set = set.intersection(*(set(d) for d in all_names))
diff --git a/validphys2/src/validphys/theorycovariance/theorycovarianceutils.py b/validphys2/src/validphys/theorycovariance/theorycovarianceutils.py
index 8060391010..a31d8bbea5 100644
--- a/validphys2/src/validphys/theorycovariance/theorycovarianceutils.py
+++ b/validphys2/src/validphys/theorycovariance/theorycovarianceutils.py
@@ -6,6 +6,9 @@
 import logging
 
 from reportengine.checks import make_argcheck, check
+from validphys.loader import Loader
+from validphys.plotoptions import get_info
+
 log = logging.getLogger(__name__)
 
 
@@ -90,72 +93,11 @@ def check_fit_dataset_order_matches_grouped(
                 "errors when running fits with theory covmat. Datasets should "
                 f"be ordered by {processed_metadata_group} in the runcard." 
             )
-    
-def process_lookup(name):
-    """Produces a dictionary with keys corresponding to dataset names
-    and values corresponding to process types. Process types are
-    regrouped into the five categories 'Drell-Yan', 'Top', Jets',
-    'DIS NC' and 'DIS CC'.
 
-
-    The implementation relies on hardcoding the process type for
-    each dataset internally. If a dataset is not registered,
-    'UNKNOWN' is returned.
+def process_lookup(name):
     """
-
-    process_dictionary = {	"ATLASZPT8TEVMDIST": 			       "DY",
-				"ATLASZPT8TEVYDIST":			       "DY",
-				"CMSZDIFF12":				       "DY",
-				"ATLAS1JET11":				       "JETS",
-				"CMSJETS11":				       "JETS",
-                                "CDFR2KT":				       "JETS",
-				"CMSTOPDIFF8TEVTTRAPNORM":		       "TOP",
-				"ATLASTOPDIFF8TEVTRAPNORM":		       "TOP",
-				"ATLASTTBARTOT":			       "TOP",
-				"CMSTTBARTOT":				       "TOP",
-				"DYE605":				       "DY",
-				"DYE886P":				       "DY",
-				"DYE886R":				       "DY",
-				"ATLASWZRAP36PB":		               "DY",
-				"ATLASZHIGHMASS49FB":			       "DY",
-				"ATLASLOMASSDY11EXT":			       "DY",
-				"ATLASWZRAP11":				       "DY",
-				"CMSWEASY840PB":			       "DY",
-				"CMSWMASY47FB":				       "DY",
-				"CMSDY2D11":				       "DY",
-				"CMSWMU8TEV":				       "DY",
-				"CMSWCHARMRAT":				       "DY",
-				"LHCBZ940PB":				       "DY",
-				"LHCBZEE2FB":				       "DY",
-				"LHCBWZMU7TEV":				       "DY",
-				"LHCBWZMU8TEV":				       "DY",
-				"D0WEASY":				       "DY",
-				"D0WMASY":				       "DY",
-				"D0ZRAP":				       "DY",
-				"CDFZRAP":				       "DY",
-				"H1HERAF2B":				       "DIS NC",
-				"HERACOMBCCEM":				       "DIS CC",
-				"HERACOMBCCEP":				       "DIS CC",
-				"HERACOMBNCEM":				       "DIS NC",
-				"HERACOMBNCEP460":			       "DIS NC",
-				"HERACOMBNCEP575":			       "DIS NC",
-				"HERACOMBNCEP820":	 		       "DIS NC",
-				"HERACOMBNCEP920":			       "DIS NC",
-				"HERAF2CHARM":				       "DIS NC",
-				"ZEUSHERAF2B":				       "DIS NC",
-				"NMCPD":				       "DIS NC",
-				"NMC":					       "DIS NC",
-				"SLACP":				       "DIS NC",
-				"SLACD":				       "DIS NC",
-				"BCDMSP":				       "DIS NC",
-				"BCDMSD":				       "DIS NC",
-				"CHORUSNU":				       "DIS CC",
-				"CHORUSNB":				       "DIS CC",
-				"NTVNUDMN":				       "DIS CC",
-				"NTVNBDMN":				       "DIS CC"	}
-
-    proc = process_dictionary.get(name)
-    if not proc:
-        log.warn(f'Unknown process type for dataset {name}')
-        return 'UNKNOWN'
+    Returns the `nnpdf31_process` of the corresponding dataset.
+    """
+    cd = Loader().check_commondata(setname=name)
+    proc = get_info(cd).nnpdf31_process
     return proc