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What is the (a) technical difference between and (b) practical difference between these, i.e., when do you use one or the other:

bool result = address(contract).call.value(10)(bytes4(keccak256("buyItem(uint256)", _sku)));

bool result = address(contract).call.value(10)(abi.encodeWithSignature("buyItem(uint256)", _sku));

The code refers to an exercise where we buy an inventory item, identified by _sku (a uint) for an amount value aka msg.value Thanks

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as per solidity documentation here

keccak256() now accept only a single bytes argument. Moreover, the argument is not padded. This was changed to make more explicit and clear how the arguments are concatenated.

Change every keccak256(a, b, c) to keccak256(abi.encodePacked(a, b, c)).

Even though it is not a breaking change, it is suggested that developers change x.call(bytes4(keccak256("f(uint256)"), a, b) to x.call(abi.encodeWithSignature("f(uint256)", a, b)).

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