Yes, they have similar specs but the browser is known to significantly differ on the devices. Or it might be me, but I couldn't really reproduce your problem. Also, the sources of the browser have not been released as of now, which means that it is impossible to make major changes to the software. Fortunately some of the improvements (saving of config file) could be accomplished by a modified starter script. The improvement of the useragent has been made directly in the binary .. that's why you have to download different files for your firmware.
Hope this makes it a bit clearer.