diff --git a/Lib/fontTools/cffLib/cff2_merge_funcs.py b/Lib/fontTools/cffLib/cff2_merge_funcs.py
index 5c2312a3c..983f22312 100644
--- a/Lib/fontTools/cffLib/cff2_merge_funcs.py
+++ b/Lib/fontTools/cffLib/cff2_merge_funcs.py
@@ -12,6 +12,7 @@ from fontTools.cffLib import (TopDictIndex,
 from fontTools.cffLib.cff2mergePen import CFF2CharStringMergePen
 from fontTools.ttLib import newTable
 from fontTools import varLib
+from fontTools.varLib.models import allEqual
 
 
 def addCFFVarStore(varFont, varModel):
@@ -105,10 +106,6 @@ def lib_convertCFFToCFF2(cff, otFont):
 	cff.decompile(file, otFont, isCFF2=True)
 
 
-def pointsDiffer(pointList):
-	return not (max(pointList) == min(pointList))
-
-
 def convertCFFtoCFF2(varFont):
 	# Convert base font to a single master CFF2 font.
 	cffTable = varFont['CFF ']
@@ -187,7 +184,7 @@ def merge_PrivateDicts(topDict, region_top_dicts, num_masters, var_model):
 				for val_list in values:
 					rel_list = [(val - prev_val_list[i]) for (
 							i, val) in enumerate(val_list)]
-					if (not any_points_differ) and pointsDiffer(rel_list):
+					if (not any_points_differ) and not allEqual(rel_list):
 						any_points_differ = True
 					prev_val_list = val_list
 					deltas = var_model.getDeltas(rel_list)
@@ -203,7 +200,7 @@ def merge_PrivateDicts(topDict, region_top_dicts, num_masters, var_model):
 					dataList = [data[0] for data in dataList]
 			else:
 				values = [pd.rawDict[key] for pd in pds]
-				if pointsDiffer(values):
+				if not allEqual(values):
 					dataList = var_model.getDeltas(values)
 				else:
 					dataList = values[0]
diff --git a/Lib/fontTools/cffLib/cff2mergePen.py b/Lib/fontTools/cffLib/cff2mergePen.py
index a89181d9a..2d2ddfe1c 100644
--- a/Lib/fontTools/cffLib/cff2mergePen.py
+++ b/Lib/fontTools/cffLib/cff2mergePen.py
@@ -4,6 +4,7 @@ from fontTools.pens.t2CharStringPen import T2CharStringPen, t2c_round
 from fontTools.cffLib.specializer import (commandsToProgram,
 										  specializeCommands)
 from fontTools.cffLib import maxStackLimit
+from fontTools.varLib.models import allEqual
 
 
 class MergeTypeError(TypeError):
@@ -271,7 +272,7 @@ class CFF2CharStringMergePen(T2CharStringPen):
 				prev_coord = x0 if is_x else y0
 				rel_coord = [pt[0] - pt[1] for pt in zip(coord, prev_coord)]
 
-				if max(rel_coord) == min(rel_coord):
+				if allEqual(rel_coord):
 					rel_coord = rel_coord[0]
 				rel_coords.append(rel_coord)
 				if is_x: