Originally Posted by Davejam
They have different HTHS specifications which is important. So, No, not technically speaking.
Not necessarily. Both 0W-20 and 5W-20 have a minimum required HTHS of 2.3 mPa.s. as per SN Plus.
Many SN Plus oils meet the ACEA C5 spec (at least in europe) in which case the minimum HTHS is 2.6 mPa.s