Vortex made their own 486 Bridgeboard-type card. I don't think they did 486 upgrades for the 2386.
No and no...
Vortex did their own bridgeboards, the ones designed for A2000/3000/4000 were all based on the 386SX.
Later on the they sold them with Cyrix CPUs falsly advertised as 486 but still a 386SX at heart (no intregrated FPU, 16bit data, 24bit address).
