Yes, it's intentional & they can peacefully co-exist (so, for example, you can cross-evaluate them). It's mentioned here
viewtopic.php?f=29&t=9644
Whether to uninstall the old V3 freeware is entirely up to you. Providing you make sure you replace (or retrieve) any V3 Zipped backups that use non-English file-names (see viewtopic.php?f=29&t=9643, also linked to from post 9644 above), you can probably do so safely. But it will do no harm to leave it there either.
viewtopic.php?f=29&t=9644
Whether to uninstall the old V3 freeware is entirely up to you. Providing you make sure you replace (or retrieve) any V3 Zipped backups that use non-English file-names (see viewtopic.php?f=29&t=9643, also linked to from post 9644 above), you can probably do so safely. But it will do no harm to leave it there either.