I removed the cracked stock manifold, and I just pulled the O2 sensors that were in it. Once removed, both of them look like this with the "shield" covering most of the sensor
Both of them look like this, whereas the replacement sensors have the probe fully exposed. BTW, the car is a 2003 MCS.



Thoughts?

 

Ok, it seems like this is the Bosch design where the replacements I got were both NTK. I'll do some reading to see if the Bosch is better for the pre-cat and change if necessary.

 

Yep looks like Bosch design. Pics from my Volvo S80



Left the original O2 sensor, on the right one a Vemo one for my Mini R53

 

Thanks for confirming, I had never seen that Bosch design before so I thought as confused as to whether it had improperly swapped since it didn't match my new ones.