That makes sense to me, both are wider than stock which should be nicer.
The 9" rear at +45 is a fairly flush fitment - it should be fine most of the time since you have stock suspension which is quite tall but you might get the occasional rubbing. I ran that rear tire and it was okay but I had added a bit of negative camber. You don't need any extra parts though so you can always try it and then dial in a bit of negative camber if needed.
A "1 series specific" rear such as the Apex ARC8 or EC7 in 9.5" wide +58 would actually be a safer bet to not rub despite being wider.
-Mark
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