Do the front end attachments from one lawn tractor brand work on another brand?
The answer is maybe.

Some companies build tractors for many different brands. E.g. Husqvarna sells their own brand of riding mowers but also makes the current Craftsman line with only minor differences in the plastic body. So a lot of attachments between those two are interchangeable (and again, made by Husqvarna). I think they also make Poulan tractors.

MTD is another manufacturer that makes their own line in addition to others like Cub Cadet, Troy-Bilt, and the older Craftsman mowers.

John Deere I believe is not associated with other brands but I'm not sure.