According to Motorcraft the modules are interchangeable.
Autozone lists the Duralast F121 for both engines and PartsAmerica has similar results.
The DY504 for the auto interchanges with the following vehicles (DY425 list for the manual transmission is even longer):
87-89 FORD All Models 4-140 2.3L SOHC
84-84 FORD All Models 4-2300 2.3L HSC
85-85 FORD All Models 4-2300 2.3L HSC
86-86 FORD All Models 4-2300 2.3L HSC
87-87 FORD All Models 4-2300 2.3L HSC
88-91 FORD All Models 4-2300 2.3L HSC
86-88 FORD All Models V6-182 3.0L OHV
87-91 FORD FULL SIZE FORD V8-302 5.0L
87-89 FORD MUSTANG V8-302 5.0L
90-93 FORD MUSTANG V8-302 5.0L
87-88 FORD THUNDERBIRD V8-302 5.0L
86-91 FORD All Models 4-153 2.5L HSC
87-92 LINCOLN All Models V8-302 5.0L
84-84 MERCURY All Models 4-2300 2.3L HSC
85-85 MERCURY All Models 4-2300 2.3L HSC
86-86 MERCURY All Models 4-2300 2.3L HSC
87-87 MERCURY All Models 4-2300 2.3L HSC
88-91 MERCURY All Models 4-2300 2.3L HSC
86-90 MERCURY All Models V6-182 3.0L OHV
87-89 MERCURY All Models V8-302 5.0L
90-90 MERCURY All Models V8-302 5.0L
91-91 MERCURY FULL SIZE MERCURY V8-302 5.0L
86-86 MERCURY All Models 4-153 2.5L HSC
86-87 FORD TRUCK AEROSTAR 4-140 2.3L SOHC
90-90 FORD TRUCK All Models V6-183 3.0L
87-92 FORD TRUCK All Models V6-177 2.9L