I am dealing with some makefiles that were written with the old-fashioned pattern rule format:

.c.o:
      $(CC) ....
.F90.o:
      $(F90) ...

Is there any functional difference between this format and the modern format

%.o: %.c
      $(CC) ....
%.o: %.F90
      $(F90) ...

or is it just in the looks of the code?