Mini-starter compatibility

Learn me something here...are the "mini starters" for use on your LA just ANY 90's Magnum Dodge truck motor, or are they also special to each individual truck?

There was a thread I read some time ago where they were discussing that after a certain year the nose was changed on them and they would have issues on older engines. I wish I could find it again but maybe somebody here is familiar with that alleged problem. Mid-90's are safe. Mine is from a '94 full size truck and my son's is off a '95 Dakota.