May have find the answer as I did more Googling this morning.
I wanted to know if they could swap those around. Probably not if the ".13" is for ROW.
I was looking to see what is the difference between these 2 version 911.618.111.
05 & 911.618.111.
13
The ".05" google return from
Porsche 911- US list it as: Porsche 911 Carrera, Years 1984 to 1986
930/21 3.2L Engine (US)
The ".13" google return from
Porsche 911- Euro list it as: Porsche 911 Carrera, Years 1986 to 1989 (ROW)
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83 911 Production Cab #10, Slightly Modified: Unslanted, 3.2, PMO EFI, TECgt, CE 911 CAM Sync / Pulley / Wires, SSI, Dansk Sport 2/2, 17" Euromeister, CKO GT3 Seats,
Going SOK Super Charger