I'd also say the 'also' variants are less common than the 'too' variants. Of course, when you don't have to thank the other because you just helped them without getting anything back, you're welcome would … Some websites have varying answers regarding the placement of also (adverb) whether it should precede before the auxillary 'have' or after.

From an answer to is it grammatical to finish a sentence with 'also'? by colin fine at english language and usage: It's perfectly grammatical, and can be substituted by other words and phrases too and as … Expats also are migrants or expats are also migrants i tried to research it but the answer i found is that depending on context both versions could be correct. Now i'm not sure which one to use.