The best information is available if you can connect it to a PC running linux -- in that case you can use lsusb -v to get a lot of information about it. It probably looks like several devices, the interesting one is, of course, the display device.

If you don't have a linux PC available, the best option is to get syslog working on the tablet (it may be as simple as installing sysklogd and then saying /etc/init.d/sysklogd start, or you may need to edit /etc/syslog.conf first, I can't remember. But certainly either remove sysklogd or use /etc/syslog.conf to turn off the logging once you have finished as it can fill up the internal disk and/or slow the tablet down). Once syslog is working, plug the device in and see what messages get reported in the log.

Unfortunately, even if you find out what it is it may not help. The kernel module is responsible for recognising the device. If it is actually the same chip but with a different ID then it would be possible to rebuild the kernel module to support it. But if it is a different chip then, presumably, a different kernel module would be needed. But see if you can find out what it claims to be and report back here!

Graham