Yes! That sounds like the same Margaret. I wasn't positive about her OR Ann (I have Ann, but Anna sounds good), but had tentatively put James Wilson in as Ann/Anna's husband, also. If all my theory is correct, Margaret and Ann/Anna are the daughters of William King/Anne Erskine both b. Scotland. Apparently the family immigrated sometime around late 1820's to early 1830's. They had 8 children: George, John (my gg-grandfather), Ann/Anna, William, Archibald, Thomas, David & Margaret. John & HIS wife Martha Crichton/Creighton left Scotland abt. the same time, but settled in PA for several years, then went to Canada (I had always thought Ontario, but have to now 'rethink' that), eventually ending up in MI. 2 other sons (Thomas, David) moved from Quebec to Iowa; I've found no record of George or William.
If you still think this is a connection (I think it is!), let's please compare notes.
Thanks so much for your response!