Convert HP38C to HP34C, is it that simple?

[tangdfx]

Hello, Tony

In the service manual said that unlike the ACT of previous calculators, the
CPU contains 1024 words of ROM. This ROM is the
only section of the CPU that differs between the three
CPU versions.

In all, the CPU consists of 11 basic sections:
a. Timing and control.
b. Address, status, and format register.
Pointer and status counters. C
d. Instruction buffer and decoding.
e. Data registers.
f. Arithmetic and logic unit.
g. Self-check logic.
h. Cathode driver logic.
1. Anode driver logic.
Keyboard interface.
k. ROM and associated logic.