Are there plans or is it possible for the 32bit and 64bit versions of 128 murmur3 to produce the same values?

[sebres]

This is possible from scratch for MM3:

• you can build MM3-x86-128 and MM3-x64-128 targeting 32-bit and 64-bit systems (or even under certain circumstances even 16-bit systems);
• MM3-x86-128 built for x86 and x64 remains the same calculated value, and it'd have almost same performance on both (or may be marginally faster on some 32-bit systems, also related optimization/compile flags);
• MM3-x64-128 built for x86 and x64 remains the same calculated value, but it is very likely faster on x64 (and slower on x86);
• both algorithms are basically not equal, so values of MM3-x86-128 and MM3-x64-128 calculated over same strings are also not equal, regardless for which system it was built;

[CheyenneForbes]

So it would be best to build MM3-x86-128 for x86 and x64 if I am looking to have both 32bit and 64bit versions of my application having equal values?

[sebres]

to have both 32bit and 64bit versions of my application having equal values?

Or even MM3-x64-128 - if it is compile-able for you on x86 and you can live with certain performance loss on x86, you'd have also equal values. The emphasis was - use same algorithm on both systems.