I don't think this is true about the footprint. People buy the SA3135 watches to drop a yuki in it. On the other hand, the yuki will not fit in the 2836 case. (Based on what I've read) crown and stem height is different. Others get the 2836 reps for ease of service and availability of parts. I think that is changing now though. The yuki or SH3135 is starting to be available in more pieces from TDs. There's a bunch of threads about this yuki vs sa3135 vs sh3135