The newer versions of Bendix Modulators are backward compatible.
There are many combinations of inlet and outlet connections, as well as several electrical connectors and voltages.
Bendix recommends one replace both modules on the axle to assure proper balance in operation.
I lost a modulator on my 2001 GMC C7500 truck when it froze and split apart.
I was able to find newer modulators similar to my obsolete cracked modulator on eBay for short money. The air plumbed right up and the harness plugged in without modification. The newer modulators function perfectly.