Steve, you don't have a layover, you have a sprint. If your train from Paris is on time, you should be OK. If it's late, you could have a problem making your connection. If you have a confirmed ticket with seat reservations, and you miss that train, AND, it's not a discounted ticket, you have 3 hours after missing your train to re-book the ticket. If it's a discounted ticket, you might want to check to see if it's changeable or not.
I really do hope that you easily make your connecting train. I'm just trying to explain some Plan B options should your Paris train be too late.