There were re-releases of early G1 toys in 1990 that were identical to their original releases -- toys, packaging etc. were all the same. They were basically a later production run and released in that year, but no actual physical differences were made. I bought a second Cyclonus in 1990 because the price had been slashed to $2 and I thought that my 1986 Cyclonus could have an "Armada" member (and also the stickers on my original had started to badly fade). There's absolutely no difference between the toys.
For that reason, I personally refer to these toys as "re-releases" to differentiate them from what people commonly think of as "re-issues" (i.e. toys that are deliberately made to be differentiated from the originals; e.g. Classic, TFC, Encore etc.). But admittedly this is just my own personal/subjective form of classification, technically either form can be referred to as a 're-issue.'
I've since traded off my 1990 Cyclonus and kept my 1986 one with the ultra-faded stickers (one of the shin stickers has completely fallen off).