Kalau u refer dekat website Celcom, I think they have already summarised it very well. But basically the difference is :
Platinum Plus- 100GB monthly Internet- FREE 100GB Super Video Walla™- Unlimited Calls to all networks- Unlimited WhatsApp and WeChat- Unlimited Calls/SMS to all networks
Platinum Plus Business- FREE Internet roaming in 9 ASEAN countries- FREE Calls and SMS roaming in 9 ASEAN countries- 100GB monthly Internet- FREE unlimited usage on WhatsApp & WeChat- FREE 100GB Super Video Walla™
But if u nak lagi confirm, chat la with their Customer Service kat FB or give the website a visit too.
Hopes this helps ヾ(＠゜▽゜＠）ノ