yup.
those 4 13mm bolts hold the diff/subframe up in position. when you take them out, you can remove the diff cover. no need to remove the 22mm bolts. if you are just changing axles, and diff oil, that's all you'll need to remove. pop the clips out, and the axle will slide out. keep track of the washers on the axle ends. keep them oriented so the replacement axles will line back up correctly.
are you putting in Chinese new axles, or reman OE axles?

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!