Islamic EPF is invested only in islamic investment instrument. So it is a bit restrictive. What I believe is, the gain/loss would not be distributed to the other side. It could have different divident or could be the same.. Time will tell.

in syariah commerce, there cannot be guaranteed profit in business, profit/loss are equally shared as partners/share holders.
Really, tbh, the biggest push for this syariah EPF is because of muslim epf members want to have a *clean* epf income which only come from syariah compliant instrument. I am not sure how it is attractive for non muslim especially when the epf switch to syariah account is not reversible.