I use the same kegs for Brett and sour beers as normal beer, and the rest of the equipment is the same as well.
I'm just careful to fully disassemble my equipment, wash in hot oxyclean solution, and sanitize with StarSan. I do this with all of my equipment whether it's a sour beer or not. About 25% of what I brew is either sour or funky, and I haven't had a cross-contamination yet. I've had one infection- a mild lacto that happened because I wasn't careful with some added ginger.
"I can't believe how many people think Air Lock is pronounced Hydrometer." -BigKahuna
"If you gave me a beer with placenta in it without telling me I would kick you in the nuts." -ODaniel
"We be in a big hurry for dope beer with much alcamahol and flavor, quality, balance, and aroma don't matter. We just wantz to be druck, u know?" -Yooper