Slylab was in the upper levels of the Thermosphere where the temperatures are around the 1000C and above range. Salyut 7 must have been lower orbit...
No. Convective heat transfer involving the atmosphere at orbital altitudes is negligible due to the extremely low mass density of the gas. Radiative heat transfer dominates the thermal solution in orbit, and it is because of the difference in radiative properties between the spacecraft that one grew hot while the other grew cold. Skylab got hot because it accidentally absorbed an excess of solar energy directly to its inner vessel, not because excess heat was transferred to it from the surrounding gaseous ambient. Salyut's thermal design, optimized for heat rejection, was still intact.
Compare the published orbital altitudes of these spacecraft with the generally accepted values of the atmosphere ranges you mention.
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