Putting 0w20 in my engine while there's still a little bit of 5w20 in it?

I accidentally bought 0w20 last night not paying close enough attention in the store but I've also read that it's completely fine to put that in my 2003 Honda Accord bevause the 2 are interchangeable, some even say that it's better.
Would it be fine topping off with the 0w20 while I still have some 5w20 in my engine still?

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