When applying for Singapore PR, because I renewed my passport and got?
yes, it is considered different travel document. I assume, you applied for PR with old passport number and waiting for the outcome of the PR application. Assuming, you granted PR, while collecting the PR, you will have a chance to update to the new passport in Re-Entry permit. Carry both your old and new passport while collecting your PR. Alternatively, you can call ICA and seek guidance.