The Mitsubishi Saturn series of engines were made in 1.2L & 1.8L engines sizes starting in 1969.
Secondly, it is not uncommon for the units built for Japan market (where the majority of "grey" markets models came from) and other countries to have a smaller engine than one built for the US market.
Other factors, units built by Mitsubishi for the US market were UL approved and compliant to ANSI/SAE standards. This means the trucks wiring, other electric components and other parts are more than likely different.
Most lift truck dealers in the US would not have a parts book for "grey" market units. Parts books for trucks produced for the Japanese markets would be printed in Japanese.
I joined Mitsubishi in 1984 in Houston, when "grey" market units were very common place & our corporate parts/service people had a real hard time finding service parts for the grey market machines. Fortunately, we had support people from Japan on staff that could eventually help if they had the serial number.