Minor correction, the 738 carries 189 pax, and some of the 752's carry 232 pax, most carry 229.
Yes the B738 has a maximum carrying capacity of 189 passengers but the B738 delivered to JET2 recently was confrgured with 186Y seats. The second B738 due for delivery to JET2 is also configured with 186Y seats. Again the B752 was designed to carry a maximum of 234 passengers but JET2 have or will have shortly 8 x B752s configured with 229Y seats, 3 configured with 232Y seats and one configured with 216Y seats (G-LSAK). These are listings from Planespotters.net and may not be updated.
In an earlier post comparing the B752 and the B738NG, it was said that:
the NG does 90% of the same job for 66% of the cost
Comparing the specifications of both aircraft, the percentages above would appear to be incorrect. In fact a comparison of the specifications of the B738 and B752 would seem to justify an argument to the contrary and show that the B752 to be equal if not superior to the B738 in every respect.
If anyone has any facts or figures that would help to clarify the above, perhaps they would kindly post them.