Problem of same printer defined 2 times one prints A4 one A3

[peter]

The problem relates to the same printer defined twice in the system, supposedly both definitions are identical but one prints on A4 - correct behaviour - but the other A3 !

lpoptions on both gives :-
for the Correct printer (A4)

job-sheets=none,standard
printer-info=ukfinance
printer-is-accepting-jobs=1
printer-is-shared=1
printer-make-and-model='HP Color LaserJet 5550 Foomatic/hpijs'
printer-state=3
printer-state-change-time=1280409122
printer-state-reasons=none
printer-type=45084
orientation-requested=4
cpi=17
page-top=50
page-right=30
page-bottom=30
media=A4
wrap=false
lpi=8
page-left=40


For the Incorrect printer (A3)
job-sheets=none,none
printer-info=hpfinance
printer-is-accepting-jobs=1
printer-is-shared=1
printer-make-and-model='HP Color LaserJet 5550 Foomatic/hpijs'
printer-state=3
printer-state-change-time=1280411748
printer-state-reasons=none
printer-type=45084
orientation-requested=4
cpi=17
page-top=50
page-right=30
page-bottom=30
media=A4,*Default,Upper,Lower,MPTray
wrap=false
lpi=8
page-left=40

Importantly, both are set to use a filter for text only output

Any ideas what I am missing here ?