Will the HOLDEN RECALIBRATED COMPUTER/PCM TO SUIT VU-VX V6be compatible with my 1998 VT Commodore?

That PCM in question won't be compatible with you PCM If you're after a replacement PCM for your VT we don't have anything to suit unfortunately, however we do have a memcal to suit as shown in the link below :

http://www.maceengineering.com.au/epages/shop.sf/en_AU/?ObjectPath=/Shops/mace/Products/MEM609/SubProducts/MEM609