"I found this picture of a different Jeep but the cluster is almost the same."

That second picture looks like the panel from an M-170 - the ambulance version of the M38A1. It has the four quick-release studs that allow the whole cluster to be "easily" removed for service. The tell-tale for that panel are the three lamps and their housings.

Your vehicle does not have the removable panel - the gauges are mounted directly to the dash. It is a different critter for sure.