Thank you - I wasn't positive if it was more of a technical analysis being requested or just the difference in the 2 parts.The K Member is the part of the car that holds the engine, steering, and some of the suspension components. The steeda k member is listed on their site as part number 555-5061 and replaces the entire factory k member. The OP installed a k member BRACE, steeda p/n 555-5536.
The GTPP (and I think all of the s650s for that matter from what I've read) have an additional k member BRACE further forward on the factory k member. That factory brace and the aftermarket steeda/BMR braces do not brace the k member in the same spot, so any aftermarket brace you buy will be an upgrade as it's bracing the rear legs of the k member which has no bracing from the factory regardless of trim or options.
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