In our forum most seem to suggest that Epson 3020 is the same as Epson TW6100 and Epson 5020UB is the same as Epson TW8100. But the pricing seems to be odd.
Epson 3020+2 pairs of 3D glasses: $1439 ie. Rs.83K
Epson 3020e+2 pairs of 3D glasses: $1899 ie. Rs.110K