Yup, they're nearly identical yeasts. If you're just trying to get your pitch rate up and have both, go for it. Otherwise, buy two of whatever's cheaper or make a starter.
Actually, those are pretty different yeasts. The Wyeast wil ferment cleanly down into the low 50s and give you a very spight smoky phenolic. The White likes considerably warmer temps and IMO doesn't make as clean a beer.
Hmmm, already made my starter and added both. I'm thinking the 028 dosn't ferment well under 62 and the wyeast 55-75 so maybe 64 would be a good compromise?