I have a question about memory management

If I install a distribution on a PC with 2 GB Ram, does system process will use more Ram than if I've installed on a PC with only 512 MB ​​Ram?

Does "free -m" will give me same result for buffers value ?

Linux will make use of pretty much all available ram, with the amount not used by the os and programs getting allocated to cache and buffers

let's look at "free -m" on my pc

free -m
total used free shared buffers cached
Mem: 3962 2911 1050 0 253 989
-/+ buffers/cache: 1668 2293
Swap: 5122 33 5089

line 1 - I have 3962mb total ram with 2911 of it currently used for kernel/programs and buffers & cached
line 2 - 1668 of of total is used by kernel/programs and 2293 is available for kernel and programs but currently (from 1st line) either free or as buffers & cached