FYI, the Ju-188S and T had longer wings than the other 188's, and was redesignated Ju-388 series.
Here's a list of the variants:
Ju 88B - Prototype test bed of existing Ju 88 bomber.
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Ju 88E - Prototype test bed of existing Ju 88 bomber.
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Ju 188 - Base Series Designation developed from the Ju 88B and Ju 88E test bed.
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Ju 188A - Fitted with Jumo series engines.
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Ju 188A-1
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Ju 188A-2 - Fitted with Jumo MW50 methanol-water injection engines.
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Ju 188E - Fitted with BMW series engines.
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Ju 188E-1
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Ju 188E-2 - Torpedo Bomber
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Ju 188C - Modified A-1 model; FA 15 powered turret fitted to tail with 2 x 13mm MG131 machine guns; single example produced.
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Ju 188D-1 - Reconnaissance Version; similar to A-1 model.
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Ju 188D-2 - Reconnaissance Version; fitted with nose radar for maritime reconnaissance.
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Ju 188F-1 - E conversion models
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Ju 188F-2 - E conversion models
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Ju 188G-2 - BMW 801 engines; increased internal bomb bay; never produced; manned rear turret.
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Ju 188H-2 - BMW 801 engines; reconnaissance platform version of the Ju 188G-2 model; never produced.
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Ju 188R-0 - Modified E models as nightfighters; radar fitted along with 4 x 20mm OR 2 x 30mm cannons in nose; never produced.
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Ju 188J - Proposed high altitude heavy-class fighter platform; sans bottom gunner position.
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Ju 188K - Proposed high altitude bomber platform; sans bottom gunner position.
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Ju 188L - Proposed high altitude reconnaissance platform; sans bottom gunner position.
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Ju 188S - Longer wings; redesignated as Ju 388 series.
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Ju 188T - "intruder" Variant; longer wings; redesignated as Ju 388 series.
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Ju 388 - High-Altitude Variant Series; limited production quantity.
Charles