A generic caffeine tablet, 200 mg and one Vivarin tablet both carry 200 mg of caffeine, per their DailyMed drug labels. Vivarin is a named over-the-counter brand built around the same common 200 mg dose as the generic tablet - the active ingredient and amount are the same.

See the source link in the table below, or add either one to the caffeine calculator to see how it fits your personal daily limit.

One tablet, side by side

Caffeine tablet, 200 mg, 1 tablet 200 mg
Vivarin, 1 tablet 200 mg

Sources

Drink Serving Caffeine Source
Vivarin 1 tablet 200 mg DailyMed drug labelSource
Caffeine tablet, 200 mg 1 tablet 200 mg DailyMed drug label (Stay Awake, caffeine 200 mg)Source