Well, the LT1469 can be purchased for roughly $14-$15 from existing stores, so there isn't much of a reason to provide it separately.  There are additional differences in the power sections and signal path between the cards besides the op-amp, which contributes to the differences in overall audio signature.  The main power section did need to be changed due to the mDP connector, but other components, namely the Audio Note Seiryu caps, play a role in the audio signature. However, that doesn't mean you can't experiment around with different op-amps to tune the original NU Audio to your liking.  Remember that for best performance, you may want to change out both the Line-Out and HP out op-amps.
 
If a front panel header is a requirement, then the original NU Audio card is really your only option between the two.

thanks for the detailed description - about the power of cards. I was interested in it.

and further. the sound card interests me only as a source of music.
It would not be bad if there were frequency response graphs for the cards.
For example, the Chinese do this to their sound engineers.
The instructions are direct. this immediately suggests a professional sound level.