how is the klondike and california gold rush the same? how are they different?

Well the most obvious similarities are the discovery of gold and the fact that miners arrived in droves hoping to make their fortunes. The most obvious difference is location. But of course these are the most obvious people would immediately think of.

Another similarity is that towns tended to spring up around where the miners based their operations. That's not to say that the miners necessarily lived in the towns themselves. The towns would have been near enough to the gold fields that new miners to those fields would pass through the town on the way to the fields. While in the town they'd be likely to purchase the equipment and supplies they'd need in the fields. Then once they had set up at the spot they would be mining for gold they'd be likely to return to the town every now and again to get new supplies. If they managed to find any gold they'd also have to return to the town to have an assayer to test the quality of the gold and confirm it really was gold and not pyrite. Not everyone knows the difference between pyrite, or fool's gold as it is also known due to it's appearance to gold, and gold so the miner's couldn't make the claim that the place they found a gold-like substance was actually a claim if it was not confirmed to be gold.

Another similarity was the fear of claim jumpers. Claim jumpers were other miners who would move in to a miners claim, especially if it were bearing cold, to take the gold out from under the person to discover the gold. They could get a little gold either from actual mining themselves in an area that really didn't produce enough could to support staking a claim to it or through other methods such as stealing it or purchasing it and then use it as "proof" they were the first to find the gold there and thus stake a claim before the rightful discoverer coukld do so.