Of the 20 unique FC DATA_SET_IDs (in 45 volumes) as of Feb 1, 2020, 
the URLs of only the first 3 below changed:
"DAWN-A-FC2-2-EDR-VESTA-IMAGES-V1.0"     	DWNVFC2_1A.lst	
"DAWN-A-FC2-3-RDR-VESTA-IMAGES-V1.0"     	DWNVFC2_1B.lst	
"DAWN-A-FC2-5-MOSAIC-V1.0"               	DWNVFC2_2.lst	
"DAWN-A-FC1-2-EDR-CERES-IMAGES-V1.0"     	DWNC7FC1_1A.lst	
"DAWN-A-FC1-3-RDR-CERES-IMAGES-V1.0"     	DWNC7FC1_1B.lst	
"DAWN-A-FC2-2-EDR-CERES-IMAGES-V1.0"     	DWNC7FC2_1A.lst	
"DAWN-A-FC2-3-RDR-CERES-IMAGES-V1.0"     	DWNC7FC2_1B.lst	
"DAWN-A-FC2-5-CERESHAMODTMSPG-V1.0"      	DWNCHSPG_2.lst	
"DAWN-A-FC2-5-CERESLAMODTMSPG-V1.0"      	DWNCLSPG_2.lst	
"DAWN-A-FC2-5-CERESMOSAIC-V1.0"          	DWNCLCFC2_2.lst	
"DAWN-A-FC2-5-CERESSHAPESPC-V1.0"        	DWNCSPC_4_01.lst	
"DAWN-A-FC2-5-VESTADTMSPG-V1.0"          	DWNVSPG_2.lst	
"DAWN-CAL-FC1-2-EDR-CALIB-IMAGES-V1.0"   	DWNCALFC1.lst	
"DAWN-CAL-FC2-2-EDR-CALIB-IMAGES-V1.0"   	DWNCALFC2.lst	
"DAWN-M-FC2-2-EDR-MARS-IMAGES-V1.0"      	DWNMFC2_1A.lst	
"DAWN-M-FC2-3-RDR-MARS-IMAGES-V1.0"      	DWNMFC2_1B.lst	
"DAWN-X-FC1-2-EDR-CRUISE-IMAGES-V1.0"    	DWNXFC1_1A.lst	
"DAWN-X-FC1-3-RDR-CRUISE-IMAGES-V1.0"    	DWNXFC1_1B.lst	
"DAWN-X-FC2-2-EDR-CRUISE-IMAGES-V1.0"    	DWNXFC2_1A.lst	
"DAWN-X-FC2-3-RDR-CRUISE-IMAGES-V1.0"    	DWNXFC2_1B.lst	
These DATA_SET_IDs were in other volumes:
"DAWN-A-FC1-2-EDR-CERES-IMAGES-V1.0"     	DWNC6FC1_1A.lst	
"DAWN-A-FC1-2-EDR-CERES-IMAGES-V1.0"     	DWNCFC1_1A.lst	
"DAWN-A-FC1-3-RDR-CERES-IMAGES-V1.0"     	DWNC6FC1_1B.lst	
"DAWN-A-FC1-3-RDR-CERES-IMAGES-V1.0"     	DWNCFC1_1B.lst	
"DAWN-A-FC2-2-EDR-CERES-IMAGES-V1.0"     	DWNC1FC2_1A.lst	
"DAWN-A-FC2-2-EDR-CERES-IMAGES-V1.0"     	DWNC2FC2_1A.lst	
"DAWN-A-FC2-2-EDR-CERES-IMAGES-V1.0"     	DWNC3FC2_1A.lst	
"DAWN-A-FC2-2-EDR-CERES-IMAGES-V1.0"     	DWNC4FC2_1A.lst	
"DAWN-A-FC2-2-EDR-CERES-IMAGES-V1.0"     	DWNC6FC2_1A.lst	
"DAWN-A-FC2-2-EDR-CERES-IMAGES-V1.0"     	DWNCAFC2_1A.lst	
"DAWN-A-FC2-2-EDR-CERES-IMAGES-V1.0"     	DWNCHFC2_1A.lst	
"DAWN-A-FC2-2-EDR-CERES-IMAGES-V1.0"     	DWNCLFC2_1A.lst	
"DAWN-A-FC2-2-EDR-CERES-IMAGES-V1.0"     	DWNCSFC2_1A.lst	
"DAWN-A-FC2-3-RDR-CERES-IMAGES-V1.0"     	DWNC1FC2_1B.lst	
"DAWN-A-FC2-3-RDR-CERES-IMAGES-V1.0"     	DWNC2FC2_1B.lst	
"DAWN-A-FC2-3-RDR-CERES-IMAGES-V1.0"     	DWNC3FC2_1B.lst	
"DAWN-A-FC2-3-RDR-CERES-IMAGES-V1.0"     	DWNC4FC2_1B.lst	
"DAWN-A-FC2-3-RDR-CERES-IMAGES-V1.0"     	DWNC6FC2_1B.lst	
"DAWN-A-FC2-3-RDR-CERES-IMAGES-V1.0"     	DWNCAFC2_1B.lst	
"DAWN-A-FC2-3-RDR-CERES-IMAGES-V1.0"     	DWNCHFC2_1B.lst	
"DAWN-A-FC2-3-RDR-CERES-IMAGES-V1.0"     	DWNCLFC2_1B.lst	
"DAWN-A-FC2-3-RDR-CERES-IMAGES-V1.0"     	DWNCSFC2_1B.lst	
"DAWN-A-FC2-3-RDR-VESTA-IMAGES-V1.0"     	DWNVFC2_1B_SAM.lst	
"DAWN-A-FC2-5-CERESMOSAIC-V1.0"          	DWNCHCFC2_2.lst	
"DAWN-A-FC2-5-CERESMOSAIC-V1.0"          	DWNCHFFC2_2.lst	

4 VIR datasets had new URLs. 4 were superseded in the PDS3 database already but not the PDS4.