I tried to go through several sites, but none of them explained if there is any difference or if any of these variants are not valid (or "not English"). At the beginning, I was using the translation dictionary slovnik.cz to translate from my native language (Czech) and both options were shown as possible:
Usually, I don't find two "same looking" words both valid and formally valid.
Written as (different in count of
- Is there any difference between them?
- Is one variation more formal (or valid) then the other?
- Is there any difference between American and British English in this case?