Yes....they are numbered 1-4, or 1-6, depending on how many arms it has.
Using the arm with the same number on each servo will....in theory give the
same position or alignment. However, the servos do not always center exactly
the same....to the arm can be change to a different number to make small
changes in the alignment.

This is a throw-back to the old....non computer radios. Now these small
adjustments can be made electronically with the sub-trims on the radio.

FBD.