I would say, "Yes" except for the sizes involved = too close in size. You might have an idea as to the the personality of the one you have and if it runs the usual forMicrocanthus sp. then you won't get any problems from this one. These fish make a generally good community fish. Is this fish very active? The Saddlebacks can go either way. My experience is about 50/50. Half the time they seem to be assertive; the other half, passive.
If you now own the Saddleback or if it is somewhere you can observe it, you might have/get a handle on its personality. If the SB will be a fish new to captivity, it may have problems, but with an appropriate quarantine time and getting to know you and you it, I think I would say go ahead.