No, INTR "generates a SIGINT signal which is sent to all processes in the foreground process group for which the terminal is the controlling terminal" (termios(4) on OpenBSD, other what passes for unix these days are similar), as complicated by what exactly is in the foreground process group (use tcgetpgrp(3) to determine that) and what signal masking or handlers those processes have (which can vary over the lifetime of a process, especially for a shell that does job control), or whether some process has disabled ISIG—the terminal being shared "global" state between one or more processes—in which case none of the prior may apply.

  $ make pa re ci
  cc -O2 -pipe    -o pa pa.c
  cc -O2 -pipe    -o re re.c
  cc -O2 -pipe    -o ci ci.c
  $ ./pa | ./re | ./ci > /dev/null
  ^Cci (2) 66241 55611 55611
  pa (2) 55611 55611 55611
  re (2) 63366 55611 55611

  $ kill -l | grep INT
   2    INT Interrupt                     18   TSTP Suspended