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Don't trust parts guys to know anything about cars that are 15 years old or so.

Base - B205L 2.0L LPT Low Pressure Turbo - Garrett GT-17
SE - B205R 2.0L HOT High Output Turbo - Mitsubishi TD-04
Viggen - B235R 2.3L HOT High Output Turbo - Mitsubishi TD-04

All engines use the same block.
SE has a bigger turbo, different intercooler, ecu tune, other cosmetic stuff.
Viggen is same as SE but has different crank, rods, pistons, different ecu tune?, cosmetic stuff.

Visual difference on the turbo can be easily seen by the way the wastegate actuator attaches to the turbo, seen here:
TD-04 on Left, GT-17 on Right.


T25 refers to the exhaust manifold flange or how the turbo mounts. They are all the same.

Each car can have different suspension codes too which are marked on a plate attached to the upper radiator support:
 

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If you were sold a metal rectangular gasket with a big round hole, 4 small holes and a raised lip around the big hole, you're good to go.

The banjo bolts and plumbing are different, but have been solved with bigger washers per Dmitry Platonoff, though not my style. His site is here and a great resource.
 

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ummm, Viggen is a completely different engine. 2.3 not 2.0...
I did mention that my first post that the Viggen had the 2.3L

Only way to tell the difference between 2.0L and 2.3L is by pulling the crank, rods, pistons and measure. Block, head, etc are all the same. You can put a Viggen or 2.3L valve cover on a 2.0L engine... Chances that someone has been duped between 2000 and 2002 because of sludge? I'd say VERY high. You'd have to see the guts to know for sure. 2.3L also have sodium filled exhaust valves, but the only way to tell is by weight.

If you have a borescope, you can pull the plugs and look at the piston tops. 2.0L pistons have a dime sized dimple in the center, the 2.3L piston has a much larger piston dish.
 
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