Bosch fuel injector questions

[Jan Pinkowish]

Patient is a 1985 4kq.
Spec'd fuel injectors are Audi #026 133 551 / Bosch 0437 502 045 and have coarse threads and the metal shroud installed on the tip.
This injector replaces Audi #049 133 551A / Bosch 0437 502 023, which also has coarse threads but no shroud on the tip.
The "045" injector is $52.  The "023" injector is $29.

Questions:
--Do both injectors have the same fuel delivery rates and the opening pressures?
--Can I just remove the metal shrouds from my old injectors and put them on the new "023" injectors(new gasket, of course)?  Any positive or negative experience doing this?
--Anyone have a link to a site listing Bosch injector specs?  I called Bosch USA and a tech couldn't help.  Did some web searching, but no luck so far.  Checked Scott's site, but no info there.

Please reply to the list so that all can share.

Jan Pinkowish
'85 4ksq
Bristol, CT