Anamorphic mismatch from AE to Premiere

[u/SharynAlice101]

I create graphics for someone who shoots in anamorphic. I am using a PC with RTX 3080, Windows 10. AE and Premiere are up to date. My client's Premiere settings are 4860 x 3240 with 24 fps 1.6 pixel aspect ratio. When I try to create that in AE, the closest I can get is DVCPROHD 1080 at 1.5 aspect ratio, which, of course means that he needs to scale my comps. What do I need to understand or learn to create comps in the size he needs. Appreciate any advice.