Wall of text, sorry
I dont think you would have any problem as is, in a few years when its less good, it might sog a bit on one side that gets to much beating compared to what it was designed for, but no, there isnt any real problem, and not al cars had different on different sides, atleast according to the EPC.
looking at EPC, the om603 turbo for example seem to have the same mount on both side, even with AC, the 124 240 17 19 (colorcoded yellow according to AUTODOCs crappy sites afaik
the om606NA equiped s124 E 300TD on the other hand seems to have the same mount when no AC the 124 240 17 19, but with AC, the Right side still has the 17 19 (yellow) and the left side gets the A 201 240 52 17 that AUTODOC supplies as both purple/orange mounts, aswell as one pink.
im a bit conflicted weather or not the 201 240 52 17 is softer or firmer than the 124 240 17 19. (since al other times the Purple/orange mounts seems softer than the yellow, but the 201 240 52 17 suddenly pops up a pink one amongst al others)
(logic says it should perhaps be firmer since it has to endure a few extra kg in weight from the AC, and the reason autodoc lists it amongs the purple/orange ones is just their way of guessing)
im just trying to make some logic out of the colorcodes, and what numbers to look for when replacing the enginemounts on the car.
stumbled upon this when searching, and thought id pop in and put in what i have "found"
will keep this updated in the future, bought some of the unmarked ones, to compare and see how they behave in the car.
Enginemounts ? colour codes | Mercedes-Benz turbo