Chuck 'n tin
Well there wuz,
C401, C401A and C401B wivout a cargo door. 300hp engines.
The C402 was the only shortnose version wiv a cargo door, then the '69 C402A and B and on got the door and the pinnochio treatment, '72 on they got square windows and a bigger cabin till '79 then the C402C got the 325hp engines and wet wing. The Pilot crew door was always an option.
And running alongside them as early as '68 was the 421, same fuse and wing as the C402 375hp and the from '70 the C414 same as but with 310hp.