Not exactly the same (but some manufactures kinda mix' em all up so it doesn't make it any easyer lol) ...

Glide generally connects the 2 samples besides bending the pitch from the inicial note 2 the ending note...

So if u have portamento between 2 notes of the same pitch nothing happens.. with glide u get one loooong note (plastikman tb303 :P)... = the eg for the amp isn't triggered aswell... (but the eg 4 the filter yes.. but I could b wrong here.. not so sure)...

portamento only acts on notes with diferent pitches...

Glide acts when it programed or when 2 notes overlap (the end of one note 2 the beguinning of another)..

Guys correct me if I'm wrong.

Z