I stuck GE:N64 on to see how the zoom/reload thing worked (someone erroneously told me the way it is in the update is how it was on the console) and I just realised that the end of Jungle is a section of the multiplayer map Caves. I never realised that before. I was going up to destroy the weapons cache and thought "hey, this is familiar..."

I bet everyone already knew this.

I came into GE:S having not played through the full campaign on my cousins N64 so I too came into this mod not knowing how some maps interconnect. I found out though about a year or two ago when I played through the original with an emulator - I recall experiencing a similar sense of déjà vu when I hit certain maps as well, haha