Those diphthongs are pronounced in exactly the same way.
But... the combinations <uij> and <uy> are old (and obselete) ways of writing <ui> and you'll only find those combinations in names (and, of course, in old texts).
In older days, <y> was often an alternative way of writing <ij> (and vice versa, but details about this would require a new thread, I guess). So, in the combination <uij>, the <uij> has nothing to do with the diphthong <ij> /ɛɪ/.
Thanks a lot! As far as the pronunciation is concerned, I have found at least two transcriptions of the diphthong ui such as [œʏ] and [ɐʏ]. The main difference is that the first transcription the starting element is rounded while in the second is unrounded. Which is the most common realization of that diphthong today? Thanks again.