How would I make a block with variant textures

[MFMods]

A have a block which uses json model and looks fine.   Model is basically this: {parent_model: something, #texture1: minecraft:oak_planks}

Now, it time for a dark oak variant and spruce, etc. - is there a non-manual way to do it?
(I know copy/paste and changing oak to other wood would take less than a minute, but I'm thinking support for modded wood would be nice to have.)

The block has a block entity too (no renderer at the moment) so I was thinking of using that, though i never rendered blocks. I would be willing to set aside an item slot for material. Let's say I do - could I tell the renderer "render the block using this model, but instead of the oak texture, use this other texture"?

[Draco18s]

Use separate blocks.

Welcome to The Flattening.

[MFMods]

ok. how about second question?

can i use block entity renderer to render a json model, but change a resourcelocation of one texture?

[MFMods]

well, that would give me auto-magical support for any plank type in the game.

did anyone have any experience with it?