Is your original battery black or white?
Black = AGM
White = Lead Acid
Ideally an AGM should be replaced with an AGM battery and most recommendations are that you should "ideally" replace a Lead Acid battery with an AGM as it has a better lifespan.
However a regular lead acid battery will work just fine as long as it is registered (and coded where appropriate).
Take a photo of the original battery or more down the 11 digit part number in the battery (xx xx x xxx xxx format) and post here if you're not sure.
Germaniks in this thread can register (& code) it for you, for a small fee.