If you want to compare specs, go here to the Browning Buckmark site.
Browning Buck Mark Pistols, Product Family
If you want to compare both specs, and prices in your area, go here to Davidson's Gallery of Guns. Click on the Gun Genie. Then Browning, then Buckmark.
www.galleryofguns.com - Buy guns online, top brands, best price, best service, best warranty; all types of guns: revolvers, rifles, pistols and shotguns.
You can check specs and availability and list prices at this Davidson site for all the Buck Mark models. And get the actual prices at dealers in your area.
If you want to know ALL things Buckmark, go here. I've put you into the rimfirecentral.com/browning sub-forum.
Browning - RimfireCentral.com Forums
This Browning sub-forum has ALL kinds of threads on "things Buck Mark". "Chim" is the master guru. You should ask "your question" here.
Yours is a fairly common question. And, they love to answer.
Also, click on the sticky "Buck Mark Starter Thread" at the top. A WEALTH of Buck Mark info awaits you.
Including all about standard vs. URX vs. UDX grips. They have different grip frames.
I waited and waited to get my Buck Mark Plus with the UDX laminated rosewood grips. I loved the "look". The other models shoot just as well.
I got it through Davidson's Gun Genie picked up by my favorite local gun store (cheapest price too). Davidson's distribution center is at our airport.
I've added a Browning "rail", and a TruGlo "cheapie" red/green multi-recticle sight. For about $85 total. Works great.
Buck Mark fever strikes just once, but lasts a lifetime. Good Luck !