If a grammar is SLR(1) then are the LALR and SLR tables the same?
The tables aren't the same.  The effect is not visible on correct inputs but on erroneous one.  The SLR tables may indicate that a reduce operation is in order and then detect that the input is erroneous after the reduction when the LALR one will directly indicates that the input is erroneous without doing any reduction.  That may have an influence on automatic error message generation and error recovery which are using the state of the push-down automaton to do their work.