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The IBM i (OS400) has generally been very good at maintaining compatibility through upgrades.
Cobwebb Server software
IBM i Version  | 
CPPD Version  | 
Notes  | 
V7R5M0  | 
v6.2.88  | 
Tested on 06/01/2025, earlier versions may also be compatible.  | 
V7R4M0  | 
v6.2.80  | 
Tested on 06/11/2019, earlier versions may also be compatible.  | 
V7R3M0  | 
v6.2.76  | 
Tested on 01/12/2017, earlier versions may also be compatible.  | 
V7R2M0  | 
v6.2.61  | 
Earlier versions may also be compatible.  | 
V5R3M0 - V7R1M0  | 
v6.2.87  | 
The last CPPD Version compatible with these OS400 versions.  | 
V7R1M0  | 
v6.0.30  | 
Minimum Version.  | 
V5R3M0  | 
v5.1.02  | 
Minimum Version.  | 
V4R5M0 - V5R2M0  | 
v6.0.5  | 
The last CPPD Version compatible with these OS400 versions.  | 
Spool-a-Matic software
Spool-a-Matic have their own downloads page listing compatibility, basically the minimum versions are:
IBM i Version  | 
Spool-a-Matic Version  | 
V7R2M0  | 
V2R8M0  | 
V7R1M0  | 
V2R7M0  | 
V6R1M0  | 
V2R5M0  |