What real difference does the lsa on a cam make?

A camshaft with a narrow 107 LSA is installed with the peak of the intake lobe at 107 ATDC
A camshaft with a wider 114 LSA is installed with the peak of the intake lobe at 114 ATDC.

This is assuming the camshaft is not retarded or advanced for tuning.

Int centre + exh centre / 2 = LSA

basically widening the LSA equates to later intake valve events. the intake valve closes later during compression stroke. this lowers dynamic compression ratio regardless of valve overlap.