Can a rider with the R1 EVO talk to another rider with the R1?

Yes. However, the rider with the R1 will need to use the +Mesh (https://www.sena.com/product/plus-mesh) with Mesh 2.0 compatible firmware in order to connect to the R1 EVO. The R1 EVO does not include the same Bluetooth Intercom feature that can be used on the R1 so the helmets will need to communicate using Sena's Mesh Intercom feature.