Food Safe Mold, then Resin

Hello, I need to make a mold of wood carvings my Dad made for cookies, and think the yellow Amazing Mold Putty for sale on this site would work (which is food safe since I don’t want to contaminate the original hand-carved mold). But for me to have a copy of his original, I then need to make a mold that I will use for cookies – thinking the blue box of clear resin (food safe) would work and be hard enough to use as my cookie press – if I’m wrong, please correct me.
If these two materials will work, do I need a release on the yellow Mold Putty before pouring in the clear resin? I don’t expect this will be easy, but I’m going for it, then will mail the originals to my brother the end of this month.
Thank you!