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I can't speak for all anomalies, but the breakthrough ones there are always 13 on all maps, some will need deep scanning. The paradox imteractive sponsor gets an additional 4 break through anomalies.
Not that I could see, nor did I find indications map "difficulty" changes anything in that respect. With regards to sponsors, it's not quite tied to difficulty but you can, nevertheless, mod in extra anomalies of all types spawning on one map for a sponsor. The PDS one is an example of how that works, they just happen to be the one with the highest difficulty rating, but that one value is set arbitrarily.
More anomalies are spawning with meteor tempests. The ones giving you a bit of research, not the others (techs.breakthroughs).