They do bring a lot of the same attributes to the table, but they do come in a little bit of a different package, with a different way of going about it.
If Bowen and Udoka can co-exist in a 8 or 9-man rotation, there's no reason to think that they couldn't do the same. Especially when you consider that only one would probably get the opportunity to crack the rotation next year, while the other sits in street clothes.(Not that any of this matters, because the Spurs don't have, and most likely won't have, a first-round pick)