Ok, if you haven't compared the size specs between the two I would recommend it. For the small difference in size I would carry the 45 over the 9.
Good luck
Might you be interested in a Khar PM45? It's in great condition, had about 400 rounds through it. Has night sights.
I may include 4 mags and a righthanded crossbreed supertuck IWB holster.
Guns I'm looking for: Ruger LCP, Glock 27
Would take $700 for the whole bundle.