Ford Fusion ABS Pump Selection

I have a 2009 FWD Ford Fusion SEL with AdvanceTrac. The HCU/ABS Pump is having an issue that is apparently decently common with these cars, where a valve in the HCU gets stuck open after the ABS is activated, greatly reducing break pressure. As far as I’ve been able to determine, this means I need to replace the part.

While searching for parts, I’ve found two that ostensibly match my vehicle, depending on where I’m searching. The parts, on fordparts.com, are these:

9E5Z-2C215-A – ABS Control Unit Traction Control With Advance Trac (MSRP ~$1350, available for ~$1100). Searching by VIN on fordparts.com indicates I need this part.

and

6E5Z-2C215-A – ABS Control Unit With Brake Only Traction Control, Less Traction Control, Traction Control W/O Advance Trac (MSRP ~$850, available for ~$600). Just about every other site says I need this part.

Ideally, I’d like to purchase the second part, because its cost is about half of the former, but I have the following questions:

1) Given that the rest of the applicable parts in my car support/use AdvanceTrac, is the non-AdvanceTrac part going to even interoperate with the rest of the system, or do all of the parts need to match exactly?

2) Assuming I can use the second part, what, exactly, do I lose going from using AdvanceTrac to “Brake Only Traction Control, Less Traction Control”?

3) For bonus points, what exactly is the difference between these two pumps? I can understand why there might be a different in, say, the 2c219 part (the computer side of the thing) in terms of handling AdvanceTrac, but what would need to be different in the pump?

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As an aside, I don’t understand how this fault hasn’t been recalled. I feel like a defect that can cause significant and sudden reduction in breaking power is a rather huge safety issue. 😐