Given his quick response to that question, I don't think he actually tested it. In fact I detect a bit of sarcasm (from icelus? nah).
Also given what I know about the mods (not much, but I've eyeballed the code of both) I don't foresee any major conflicts. But the proof of the pudding is in the eating, or testing in this case. The current BG1 version of Dark Side tends to overwrite a lot of files, so I would suggest installing DSotSC first, then BG1UB.
I was looking at the Compatibility thread and the question of DS & BG1UB compatibility was asked to which Icelelus answered nope. The last post there was this question and his answer and that was in July 06 so I was wondering if there had been any progress. I could go ahead and try it tho.
Does anyone know of any specific problems between these mods?
If you're asking about making BG1UB compatible with DSotSC, why wouldn't it be? If you've installed and tested both in BG1 and find any glitches, by all means, post them.
If you're asking about a Tutu-compatible version of DSotSC, see this.
Please dont beat me for asking what appears to be a dead question but are there any plans create a DS compatible version? Would it be okay if other people created one and would it be supported here? Im no modder but perhaps someone at CoM or SHS would be interested in creating it.