There are two schools of thought on wood and model building one is "so what" that is what came in the kit so use it. Then on the other hand is the slight color shift bothers you in this case avoid kits that supply laser etched decking sheets because a kit manufacture is not going to hand select each and every sheet that goes into every kit. Way to make the deck to your personal liking is the cut the deck sheet apart into single strips and break up the color differences. Or mill your own deck planking or buy replacement planking.
Use woods that do not have a pronounced grain pattern like Maples like hard maple, silver maple, soft maple, Poplar, Basswood, Boxwood or natural pearwood (un steamed) to name a few. A lot of different woods can be used but you have to plan on how you are going to cut the planking. When milling your planking rip down the strips square and run them through a thickness sander to the width dimension, then look at the strips and turn them at a 90 degree so the surface of the plank is quarter sawn. If you want to rip down your own planking but need resawn wood for smaller saws order the thickness of the sheet to the width of the planking not the thickness. This gives you the option of turning the strips. you can ask for "flat sawn" sheets to the width of the finished planks so when you rip the sheet down you are at a 90 degree of the flat sawn surface. If you order sheets to the finished thickness then you need to buy quarter saw sheets.
in large planks stability can be an issue but in the small scale planking it does not make a difference.