Yes and no. (TLDR: BOA can definitely show a good idea of placement at UIL when the scores and placements are wide enough [5+ spots-ish] but when you get in that closer range, the difference in judging can make a real impact on placement between the two contests.)
In general you can definitely make a claim that if you're more than 5 spots apart at a BOA, you'll most likely rank higher in UIL, but when you get within 5 spots of one another, it's less cut and dry. BOA emphasis GE and how impressive your show is from an audience standpoint. Whereas UIL emphasis more traditional ideals of perfect ensemble blend and visual execution with less emphasis on GE. (Which isn't to say BOA doesn't also have really high standards for ensemble blend and execution, BOA just prioritizes other aspects of a show instead of execution alone.) That difference in judging makes it difficult to determine placement for UIL based off BOA. For example, if a BOA show isn't performed it's best but there is a lot of unique music and visual GE, they can place pretty well, but a UIL judge watching that same show is more likely to rank them lower as GE is less of a priority in their rubric.