Yes and No, the 1.6 Laguna box is different to the 1.6 Clio/Megane box, different positions on the gearstick (reverse down and right) and ratios are slightly different. JB3 on your Clio/Megane, whereas the Laguna is a JR5 box.
The trouble with the engines on eBay is you can never be certain of the history of them, could be buying a duffer! Only for it to go wrong a few months later, but they are cheap might be lucky. Why not phone up the Renault Breakers (matt black his name is on here) and see how much a 1.6 engine is?