In Spanish it's called "transfuguismo".
closed as off-topic by Brian Hooper, FumbleFingers, TrevorD, Kristina Lopez, Robusto Jul 25 '13 at 10:27
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Although it seems that "transfuguismo" roughly means "turncoat" or "defector." I may be wrong, but a similar word in English is "flip-flopper" (in the case of changing opinion on a subject) or simply, a "party switcher" (in the case of changing political parties entirely).
Transfuguismo appears to refer to party switching, where a partisan politician changes his or her membership to a different party, usually for career advancement. Similar terms include crossing the floor, and in New Zealand the colorful term waka-jumping. (Crossing the floor and crossing the aisle may also refer to politicians who vote against their party leadership without necessarily changing membership, however).
There is no single word reflecting a public official's change of post; one would simply say that they had been appointed or elected to a new position as the case may be, or perhaps switched or transferred. A shakeup in which multiple executive cabinet members are moved to different positions is known as a cabinet reshuffle.
Political musical chairs is a common colloquial usage in the U.S. for the phenomenon where a vacancy in elected office results in a scramble among politicians; perhaps the retirement of a long-time senator means the governor appoints himself to that seat, leaving the lieutenant governor to become governor, and for the comptroller to announce her candidacy for lieutenant governor. It is noted particularly where term limits are in effect, turfing out career politicians in mid-career and forcing them to run for other offices, and after reapportionment/redistricting, where gerrymandering forces representatives from previously "safe" districts to compete.
Resources reassigned from one task to another are being redeployed. It seems there is some underlying nuance you are trying to include, but without more information I would say the word you need is redeployed.