Are aoe2 hd and the original supposed to look similar?

Like many, I'm returning to aoe2 after a ten year hiatus.

I bought the aoe2 hd and the expansions on Steam. I've read the multiplayer is a lot better on the original version, played via voobly. So I tried to set that up too. Voobly helped me get the necessary patches and mods to play, so it's ok in that sense.

My screen supports 4k, but I only have it set to HD (in Windows and in game). It looks good on aoe2 hd, but looks very pixelated on the original version. I guess it makes sense as it's almost twenty years old, but then I see people claiming that the visual difference between the two versions is small / hardly noticeable.

Is it possible to get similar visuals from the original?