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Depending on the camera, sensor temperature will stablise or suffer from more significant fluctuations between images. The first or the first few images, depending on the camera will be cooler.
If you image at a set rate and take your darks in the same way, temperature differences should be acceptably close, providing ambient air temperature does not change significantly.
Temperature matching is best achieved for an uncooled DSLR on the same night. Older APS-C Canon DSLRs don't get lividly hot.
The best advice is to keep taking darks immediately following imaging, if you do not use in-camera reduction (hot topic). Slip the lens cap on and keep going - keep the sensor as close to temperature as possible. Dither the lights to eliminate/reduce temperature mismatch artifacts.
Don't let the sensor cool between images too much - just enough to dither and lock the mirror up, before activating the shutter.
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