Hmmmm never done a comparison before, but you have given me food for thought, so in hunting for TD 27 Bosch injectors also found my old RD28 nozzles.
RD28 = DNOSDN 187
TD27 = DNOSD 252 + /
The only difference I can see on an initial check is that the needle size where it passes through the body orifice is larger on the 28 than on the 27 the orifice being the same which will follow as the 28 being 6 cylinder will require slightly less fuel per bang than the 27,the sizes are 37 thou for the 27 and 38 for the 28
In all other respects the nozzles are the same although I was not able to see the volume available at the bottom of the needle.
Net result of all this is that I will be keeping the 2.7 injectors as poss donors for my 2.8 Rick
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Ex banger racer now off road maniac 
Lokka on the front with manual hubs
Diff lock on rear
3 inch SS straight through exhaust
Manly winch bumper with 13000 lb winch
10 spike ground anchor, with multiple straps and blocks
Super strong body cills capped with scaffold pole
20% stronger springs all round
aggressive off road tyres on wheels so just swap.
Aim to get stuck and be completely self sufficient in extraction, love getting muddy, 2ft deep is good but rare.
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