Visit bedrug.com or accesscover.com or anything that comes up under google for bed rug. A mat is usually reference to just a mat, no sides of the bed or tailgate. A mat however can come in rug, rubber or other materials whereas the full bedrug is rug.
Bedrug seems to be the top going brand mentioned around here so hopefully someone will check in with the part numbers for you as it seems the 19 versions are not published on the sites yet.
FWIW, I use a mat (carpet). I used Bedrug on my 14 and liked it except for the Velcro strips used to hold it down. I switched over to Access on my 19 as their hold down solution is snaps that seem to be working very well for me. The Access however is not ribbed like the Bedrug version. That didn’t bother me as I just want things to not slide. If I were to “camp” in the bed of my truck, the ribbed form fitting version of the Bedrug would be the ticket.