New Holland Chain Baler?

I'm looking at a couple chain balers that are local and cheap. One is a 845 and the other is a 849. What are the differences between these two? I know they're antique by most standards but I'd probably make 100 or so bales a year is all and figured it might be cheaper than paying the neighbor $7 per bale for a 4x4 bale. I know they're soft core and make kinda ugly bales but I really don't think my mom's horses will care and I'm not interested in selling round bales so I'm not really super worried about marketability. So do any of you guys think either of these would work for me?

New Holland Chain Baler?