Could one of them be synonymized or merged with the other (I don't know which)?
I'm not quite sure about this one. After comparing the questions, I can see some differences:
- Questions tagged as asking-questions mostly involve asking about whether or not a certain question can be asked here.
- Questions tagged as questions involve things such as feature requests or anything else about existing questions (which are also not about specific-questions).
In this case, it seems that synonymizing or merging them would not make sense. Plus, MSO has these two tags separate, and the mechanics of these tags should still apply to per-site metas.