The “two versions” of Oliver that Amell is referring to could be present and past Oliver, or it could be Oliver in costume as Arrow vs. Oliver out of costume as himself.
For better or worse, Arrow fans have seen a whole lot of Oliver Queen’s past, and that trend is not going away anytime soon.
A recent comment from Arrow‘s lead actor Stephen Amell, however, offers the possibility that a plot point in the upcoming season will offer a different look at Oliver than the present and past iterations that audiences have seen so far.
It could also be that Oliver is due for a costume change, and episode 97 is when it happens.