A198311 and A334285. 
Minimal (with respect to perimeter) n-tuples of Heronian triangles with equal perimeter (p) and equal area (A), for 1 <= n <= 12.

n = 1, A = 12, p = 6
(3, 4, 5)

n = 2, A = 210, p = 70
(17, 25, 28), (20, 21, 29)

n = 3, A = 420, p = 98 
(24, 37, 37), (25, 34, 39), (29, 29, 40)

n = 4, A = 6720, p = 448
(74, 182, 192), (84, 164, 200), (96, 149, 203), (104, 140, 204)

n = 5, A = 49140, p = 1170
(221, 445, 504), (225, 438, 507), (261, 389, 520), (273, 375, 522), (312, 333, 525)

n = 6, A = 196560, p = 2340
(442, 890, 1008), (450, 876, 1014), (522, 778, 1040), (533, 765, 1042), (546, 
  750, 1044), (624, 666, 1050)

n = 7, A = 4914000, p = 11700
(2100, 4758, 4842), (2210, 4450, 5040), (2250, 4380, 5070), (2610, 3890, 5200), (2665, 3825, 5210), (2730, 3750, 5220), (3120, 3330, 5250)

n = 8, A = 91400400, p = 84630
(4650, 39585, 40395), (4875, 39060, 40695), (7323, 35867, 41440), (8619, 34440, 41571), (9672, 33315, 41643), (13020, 29835, 41775), (16275, 26520, 41835), (17745, 25035, 41850)

n = 9, A = 348107760, p = 94668
(19020, 37674, 37974), (19449, 35949, 39270), (19734, 35322, 39612), (20604, 33814, 40250), (22374, 31395, 40899), (22998, 30636, 41034), (24564, 28854, 41250), (24978, 28406, 41284), (25806, 27534, 41328)

n = 10, A = 4765400640, p = 428736
(51348, 185640, 191748), (51918, 183744, 193074), (54663, 177888, 196185), (62268, 166716, 199752), (65598, 162498, 200640), (71412, 155556, 201768), (88008, 137228, 203500), (91872, 133143, 203721), (101268, 123396, 204072), (102828, 121800, 204108)

n = 11, A = 17057280240, p = 662676
(133140, 263718, 265818), (136143, 251643, 274890), (138138, 247254, 277284), (144060, 236958, 281658), (144228, 236698, 281750), (156618, 219765, 286293), (158466, 217488, 286722), (160986, 214452, 287238), (171948, 201978, 288750), (174846, 198842, 288988), (180642, 192738, 289296)

n = 12, A = 68229120960, p = 1325352
(266280, 527436, 531636), (266511, 524436, 534405), (272286, 503286, 549780), (276276, 494508, 554568), (288120, 473916, 563316), (288456, 473396, 563500), (313236, 439530, 572586), (316932, 434976, 573444), (321972, 428904, 574476), (343896, 403956, 577500), (349692, 397684, 577976), (361284, 385476, 578592).