diff --git a/jwst/regtest/test_miri_mrs_dedicated_mbkg.py b/jwst/regtest/test_miri_mrs_dedicated_mbkg.py
index 93e5bcdba3..70edbee567 100644
--- a/jwst/regtest/test_miri_mrs_dedicated_mbkg.py
+++ b/jwst/regtest/test_miri_mrs_dedicated_mbkg.py
@@ -10,27 +10,41 @@ def run_pipeline(rtdata_module):
 
     rtdata = rtdata_module
 
-    rtdata.get_asn("miri/mrs/miri_mrs_mbkg_0304_spec3_asn.json")
+    rtdata.get_asn("miri/mrs/jw01031-c1004_20241028t205539_spec3_subset_asn.json")
 
-    MasterBackgroundStep.call(rtdata.input, save_results=True, suffix='master_background')
+    MasterBackgroundStep.call(rtdata.input, save_results=True, suffix='mbsub',
+                              save_background=True)
 
     return rtdata
 
 
 @pytest.mark.bigdata
-@pytest.mark.parametrize("exp_seq", ["exp1", "exp2", "exp3"])
-def test_miri_mrs_dedicated_mbkg(run_pipeline, fitsdiff_default_kwargs,
-                                 exp_seq):
+@pytest.mark.parametrize("exposure", [1, 2, 3, 4])
+@pytest.mark.parametrize("suffix", ["mbsub", "c1004_masterbg2d"])
+def test_miri_mrs_dedicated_mbkg(run_pipeline, fitsdiff_default_kwargs, exposure, suffix):
     """Run a test for MIRI MRS data with dedicated background exposures."""
+    rtdata = run_pipeline
+    output_file = f"jw01031001001_02101_0000{exposure}_mirifulong_{suffix}.fits"
+    rtdata.output = output_file
+
+    # Get the truth file
+    rtdata.get_truth(os.path.join("truth/test_miri_mrs_dedicated_mbkg", output_file))
+
+    # Compare the results
+    diff = FITSDiff(rtdata.output, rtdata.truth, **fitsdiff_default_kwargs)
+    assert diff.identical, diff.report()
+
 
+@pytest.mark.bigdata
+def test_miri_mrs_dedicated_masterbg1d(run_pipeline, fitsdiff_default_kwargs):
     rtdata = run_pipeline
-    rtdata.output = "miri_mrs_seq1_long_34_" + exp_seq + \
-                    "_master_background.fits"
+
+    # Check 1D masterbg output product: created with root name from nod 1
+    output_file = "jw01031006001_02101_00001_mirifulong_c1004_masterbg1d.fits"
+    rtdata.output = output_file
 
     # Get the truth file
-    rtdata.get_truth(os.path.join(
-        "truth/test_miri_mrs_dedicated_mbkg",
-        "miri_mrs_seq1_long_34_" + exp_seq + "_master_background.fits"))
+    rtdata.get_truth(os.path.join("truth/test_miri_mrs_dedicated_mbkg", output_file))
 
     # Compare the results
     diff = FITSDiff(rtdata.output, rtdata.truth, **fitsdiff_default_kwargs)